Outer Limits 4x4 Board

can i mount a blowoff valve on my sd33t? i want to be fully sik

turbo diesel's don't work the same as petrol turbo's so I don't think you can actually fit one.

the noise you hear is wastegate flutter on highly boosted turbo's

but maybe they have figured out a way to do it

you can stick a blow off valve on any combustion engine turbo or not.
they are a total wank why would you? maybe you should start talkin to fast fours & rotaries dude.

they are not "total wank".. they do actually have a purpose

the way to hook up a blow off valve on a diesel, is to add a butterfly somewhere between the turbo and the injector pump, and connect the throttle cable to that. You also have to jam the throttle on the old pump open (as the butterfly will add air into the system, as opposed to the other way around)

If that makes sense..

A blow off valve release's excess inlet air(boosted air) when you back of the throttle so when you reapply throttle there is no/less lag.
Which is why you hear a phssh sound between gear change's.

When i had a sd33 patrol it had a aftermarket turbo set up on it with external wastgate/t3 turbo and a small bov.It had one because it was running high boost and needed to be bled between gear changes otherwise it would lag badly.

To answer your question yes you can but if it is for sound(wank value) dont bother as if your running std boost your wont hear anything or very little.....imo.

st george mufflers wrote:you can stick a blow off valve on any combustion engine turbo or not.
they are a total wank why would you? maybe you should start talkin to fast fours & rotaries dude.

It can't be fitted to nat aspirated vehicles.You need boost pressure to open the valve.

st george mufflers wrote:you can stick a blow off valve on any combustion engine turbo or not.
they are a total wank why would you? maybe you should start talkin to fast fours & rotaries dude.

Thank god I didn't get my exhaust done at your business, you don't know shit about mechanics.

dont they have a factory sort of blowoff valve? on the right hand side of the manifold, it's plastic and looks like a bung kinda thing ?

The words "fully sick" and "SD33T" shouldnt/cant be used in the same sentance. just buy a old SSB radio on ebay with a PA switch. Then you can be fully sick Even without changing gears

Good luck fitting a proper blow off valve to a diesel

Your factory blow off valve is more common called a reliefe valve where it is set to a boost presure and when someone or a mechanical fault the boost has raised this the valve will open saving your motor.

Blow off valves are mainly used to manual cars for in between gear changes the valve opens to let the turbo keep spooling and not stall. You need vacuum to open the valve and as most people know diesels have no vaccum.

Yes it could be done but not very simple.

GASDRX wrote:Good luck fitting a proper blow off valve to a diesel

Your factory blow off valve is more common called a reliefe valve where it is set to a boost presure and when someone or a mechanical fault the boost has raised this the valve will open saving your motor.

Blow off valves are mainly used to manual cars for in between gear changes the valve opens to let the turbo keep spooling and not stall. You need vacuum to open the valve and as most people know diesels have no vaccum.

Yes it could be done but not very simple.

if people use the SEARCH, then they would know all they need to know.

Blow offs aren't a wank, noisy ones are. plumb back type blow offs are more appropriate where cops are concerned..
reagrdless. its simple if you have no butterfly or throttle cut off in your plenum chamber/ intake you have no vacumn to activate the "blow off"..therefore you have no pressure on your turbo on gear change etc etc

putting a BOV on a diesel is possible but unless you have a factory butterfly setup like the landcruiser 60 series, Why the hell would bother, you won't gain any perfomance putting one on if you have no need for one. it would be more work than its worth.

efi/ petrol different story, you need to relieve the pressure from the turbo boost to prevent turbo damge as the throttle snaps shut the turbo is still bossting pressure in the intake system.



cheers

apart from being trade quallified & repairing/modifying turbo/non tubo engines everyday , YOU would presume i dont know s**t..

st george mufflers wrote:apart from being trade quallified & repairing/modifying turbo/non tubo engines everyday , YOU would presume i dont know s**t..

you are entiltled to your opinoin. but please tell me for all our benefit, in your opinion "turbo guru" what happens to the excess boost in the intake system when a butterfly setup is concerned without a blow off valve keeping in mind "they are a wank"

cheers

HE HE,STILL WAITING....ARE YOU NOW?

You mean dump valve?
I´m turbocharcing my SD33 at week 11,with 52/63 Holset,wastegate is own product, also dump valve is own product (with nylon piston,perhaps)

st george mufflers wrote:apart from being trade quallified & repairing/modifying turbo/non tubo engines everyday , YOU would presume i dont know s**t..

But you have no clue dude.

When you get one, trade qualified or not come back and then I will listen to your opinion.

diesel we are talking here.you would be concerned about the excess boost if you wanted to achieve say 1 bar + you would consider installing such an item. Realistically , 6-10 psi is sufficient and not what you call excess boost. Scania Sydney has plenty of tech info if you care to look them up regarding turbo/diesel , sorry took so long to pen i dont sit on my arse all day.

st george mufflers wrote:diesel we are talking here.you would be concerned about the excess boost if you wanted to achieve say 1 bar + you would consider installing such an item. Realistically , 6-10 psi is sufficient and not what you call excess boost. .

If you had no restriction you wouldn't need a blow off valve would you! so for arguments sake.. if i had a gq patrol "turbo diesel" running 24lb of boost forged pistons etc, no blow off. your saying that this would cause problems but not at 6-10 lb even though there is no restriction in the intake. whats there to be concerned about..

WTF

oh and i agree, you don't spend all day on here because if you did you might have learnt something if you listen to what other people have to say instead of being a typical know how " O Great one" .

tell if u dont have a butterfly then why would u want to exhaust all that loveley boost going in to thoses cylinders between gears. my gq can manetane 5 psi between gears

Just goes to show those who understand how a diesel works and those that don't have a f#ckn clue!!!!!!!

The acceleration of a diesel engine is control purly and simply by the amount of fuel supplied by the injectors.

The intake is open and clear, the engine takes a full breath or air everytime the intake valve opens at all times.

There is never "still" pressureised air in the intake system that could stall or spin the impeller backwards, unlike in a petrol engine, when you change gear the butterfly in the intake snaps closed as you take your foot of the gas, and restricts the intake down to only just enough to idle on. Pressure then builds up between the butterfly and the impeller.

The Diesel engine is always drawing air, always always always, there is NEVER an opportunity for boost to build up to the point were it will stall the impeller. And unless the waste gate on the turbo is not functioning correctly, there is no need to bleed of pressure from the system.

Now if someone can devise an antilag system for a diesel i'm all ears

It would have to be like the anti lag on the old carburetted rally car's, with an injector in the exhaust mainfold, and a stepper motor connected to the trottle assembly that opperates when the accellerator pedal is released...........................

Imagine that on a diesel, oooh the smoke that would make

Just a flying idea: Why not replace the relief valve with an electrically operated valve, and trigger it with a switch activated by the clutch pedal. That way you would "punkture" the pressure during gearshift and let the turbo spin more freely ..... eeer, on both up and downshift - maybe that wasn't that smart anyway....

"Now if someone can devise an antilag system for a diesel i'm all ears "

-isn't that what propane-assist on diesels is for....?

st george mufflers wrote:diesel we are talking here.you would be concerned about the excess boost if you wanted to achieve say 1 bar + you would consider installing such an item. Realistically , 6-10 psi is sufficient and not what you call excess boost. Scania Sydney has plenty of tech info if you care to look them up regarding turbo/diesel , sorry took so long to pen i dont sit on my arse all day.

hahahahahahahhaahahahahahhaaha

just owned yourself

Again, thank fuck I didn't get my exhaust installed by the great turbo guru.

bluemq wrote:

st george mufflers wrote:diesel we are talking here.you would be concerned about the excess boost if you wanted to achieve say 1 bar + you would consider installing such an item. Realistically , 6-10 psi is sufficient and not what you call excess boost. Scania Sydney has plenty of tech info if you care to look them up regarding turbo/diesel , sorry took so long to pen i dont sit on my arse all day.

hahahahahahahhaahahahahahhaaha

just owned yourself

Again, thank ***** I didn't get my exhaust installed by the great turbo guru.

OWNED...HE HE
You're supposibly the 'turbo guru' telling the stories,why do we need to ring SCANIA.........or is that what you did so you sounded like a 'professional'?
I'm with bluemq....we'll pass on any exhaust work.

this thread is still going? lol... i got my answer long ago

[quote="DieselBoy"]Just goes to show those who understand how a diesel works and those that don't have a f#ckn clue!!!!!!!

The acceleration of a diesel engine is control purly and simply by the amount of fuel supplied by the injectors.

The intake is open and clear, the engine takes a full breath or air everytime the intake valve opens at all times.

There is never "still" pressureised air in the intake system that could stall or spin the impeller backwards, unlike in a petrol engine, when you change gear the butterfly in the intake snaps closed as you take your foot of the gas, and restricts the intake down to only just enough to idle on. Pressure then builds up between the butterfly and the impeller.

The Diesel engine is always drawing air, always always always, there is
NEVER an opportunity for boost to build up to the point were it will stall the impeller. And unless the waste gate on the turbo is not functioning correctly, there is no need to bleed of pressure from the system.




Very true in every diesel iv'e ever seen exept one. The ol humble 2H. Now they have a butterfly in the system like a throttlebody box. What is the purpose of that? Any clues guru's?

sd33 have buterfly in them..atleast uk versions do.vacum controlls pump fueling..

zen wrote:sd33 have buterfly in them..atleast uk versions do.vacum controlls pump fueling..

only non turbos have this

cheers

i got an MK Turbo Diesel and it comes standard out of the factory with a Blow Off Valve it fits on an elbow piece that bolts to the intake manifold!

its an over boost valve not a bov